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Guarantees and commitments - Other guarantees (Details 2) - CHF (SFr) SFr in Billions	6 Months Ended	12 Months Ended
	Jun. 30, 2023	Dec. 31, 2024	Jun. 30, 2024
Guarantees
Amount jointly guaranteed by deposit-taking banks and securities dealers in Switzerland		SFr 6.0
Deposit Insurance Guarantee Scheme, Amount Guaranteed, Percentage		1.60%
Group's share in amount jointly guaranteed by deposit-taking banks and securities dealers in Switzerland	SFr 0.6		SFr 0.6

X

- Definition

Represents the amount jointly guaranteed by deposit-taking banks and securities dealers in Switzerland under deposit insurance guarantee scheme.

+ References

No definition available.

+ Details

Name:	cs_DepositInsuranceGuaranteeSchemeAmountGuaranteed
Namespace Prefix:	cs_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	cs_DepositInsuranceGuaranteeSchemeAmountGuaranteedPercentage
Namespace Prefix:	cs_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the share of reporting entity in the total amount jointly guaranteed by deposit-taking banks and securities dealers in Switzerland in deposit insurance guarantee scheme.

+ References

No definition available.

+ Details

Name:	cs_DepositInsuranceGuaranteeSchemeShareOfEntityInAmountGuaranteed
Namespace Prefix:	cs_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_GuaranteeObligationsLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration